April 24, 2025 By Sergiu Gatlan
A ransomware attack in January at Frederick Health Medical Group, a major healthcare provider in Maryland, has led to a data breach affecting nearly one million patients.
With almost 4,000 employees and over 25 locations, Frederick Health is one of Frederick County's largest employers.
As the health system revealed in a late March notification to patients, the ransomware attack was detected on January 27, which prompted Frederick Health to notify law enforcement and hire a third-party forensic firm to investigate the incident's impact.
"On January 27, 2025, we experienced a ransomware event affecting our IT systems," the health system said. "The investigation determined that an unauthorized person gained access to our network and, on January 27, 2025, copied certain files from a file share server."
"We are mailing letters to individuals whose information may have been involved and for whom we have sufficient contact information," it added.